2nd person arrested after investigation into social media threat

A threat posted on Twitter Thursday, Jan. 28, 2016, by user TheWhiteFlip is under investigation by Elk Grove Unified School District Police. Students believe the tweet targets Franklin High School. The tweet was deleted around 9 p.m. Thursday.

Several concerned parents reported the post about 5:10 p.m. from Twitter user ThaWhiteFlip that read, "Don't come to school tmrw I ain't playin."

The post, which featured the student wearing a ski mask and holding what appeared to be an assault rifle, was deleted about 9 p.m., deputies said.

The threat was later deemed "not credible" by investigators, the Elk Grove Unified School District said.

Deputies identified the student who made the threat, and he was later arrested at his home on charges of criminal threats by means of an electronic communication device, officers said.

Further investigation led to a second person, 19-year-old Jonathan Huynh of Elk Grove, who was found in his home and in possession of the assault rifle pictured in the Twitter post, according to investigators.

Sacramento County Sheriff's Department

Huynh was arrested for possession of an illegal assault rifle, but was not arrested as part of the social media threat, deputies said.

"The immediate reporting from our community of these kinds of threats, along with our district’s immediate response working collaboration with law enforcement are key elements to keeping our schools and community safe," Hoffman said. "These kinds of threats are taken very seriously and investigated fully."